Metal–Organic frameworks encapsulated with vanadium-substituted heteropoly acid for highly stable asymmetric supercapacitors

Mohamed, Aya M.; Ramadan, Mohamed; Ahmed, Nashaat; ElNaga, Ahmed O. Abo; Alalawy, Hafsa H.; Zaki, Tamer A.; Shaban, Seham A.; Hassan, H.B.; Allam, Nageh K.

doi:10.1016/j.est.2020.101292

Cited by 51 publications

(35 citation statements)

References 55 publications

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“…The specific capacitance of the active materials was calculated using the data obtained from the CV and GCD experiments using reported equations . The charge storage mechanism can be generally illustrated using the cyclic voltammogram . From Equation (1), the slope “b” from plotting log v Vs. log I can be correlated to the charge storage mechanism.…”

Section: Methodsmentioning

confidence: 72%

“…From Equation (1), the slope “b” from plotting log v Vs. log I can be correlated to the charge storage mechanism. “b” can have values of either 0.5 corresponding to Faradic intercalation mechanism, or 1.0 corresponding to surface capacitive mechanism

true i = a v^{b}

…”

Section: Methodsmentioning

confidence: 99%

“…In case the “b” value was in between the 0.5 and 1, Equation (2) can be used to give the surface EDL mechanism resulting current (k 1 v) and the Faradic mechanism resulting current (k 2 v 1/2 )

true \frac{i_{V}}{v^{1 / 2}} = k_{1} v^{1 / 2} + k_{2}

…”

Section: Methodsmentioning

confidence: 99%

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Fullerene C₇₆: An Unexplored Superior Electrode Material with Wide Operating Potential Window for High‐Performance Supercapacitors

2020

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Carbon materials have widely been used to enhance the performance of a plethora of supercapacitor electrode materials. In this regard, it is crucial to identify carbon materials that function over a wide pH range while enjoying a wide potential window. Herein, the DFT calculations were used to elucidate the electronic performance of C 76 and the C 76 /electrolyte interface. The electronic investigation revealed the nature of the conductivity and charge storage mechanism of C 76 based on the bandgap and quantum capacitance calculations. Also, the electrochemical and electronic properties of fullerene C 76 have been extensively investigated over a wide pH range; acidic H 2 SO 4 , basic KOH, and neutral Na 2 SO 4 . The results showed a promising performance in the three electrolytes. Moreover, C 76 electrodes exhibited a potential window of 1.9 V in Na 2 SO 4 electrolyte, resulting in capacitances of 171 F/g and 142 F/g at a scan rate of 1 mV/s in the positive and negative potential windows, respectively. The material showed a pseudocapacitance performance of 65 % in Na 2 SO 4 electrolyte in the positive potential window. We believe higher fullerenes provide a new class of materials for developing versatile supercapacitor devices for efficient energy storage.Laboratory is highly appreciated. We also acknowledge Bibliotheca Alexandrina HPC for allowing us to use the HPC resources.

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Section: Methodsmentioning

confidence: 72%

true i = a v^{b}

…”

Section: Methodsmentioning

confidence: 99%

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Fullerene C₇₆: An Unexplored Superior Electrode Material with Wide Operating Potential Window for High‐Performance Supercapacitors

2020

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“…The semicircle diameter indicates the charge transfer resistance (R CT ) to the redox reaction, whereas the high frequency intercept on the X-axis reveals the series resistance (R Ω ), which includes electrolyte resistance, the internal resistance of the active material, and the contact resistance at the solid-liquid interface. [52,53] The R ct and R Ω for the air-annealed and H 2 -treated TiÀ MoÀ NiÀ O nanotubes were found to be 1.34 and 0.83 Ω, respectively. From the Bode plot (Figure 4f), the estimated time constant for the hydrogenannealed TiÀ MoÀ NiÀ O nanotubes is 8.2 ms, which is significantly lower than that estimated for the air-annealed counterpart (18.1 ms).…”

Section: Resultsmentioning

confidence: 95%

“…Figure e illustrates the Nyquist plots in the frequency range 0.01 Hz −100 kHz, which exhibit linear and semicircular parts in the low and high frequency regimes, respectively. The semicircle diameter indicates the charge transfer resistance (R CT ) to the redox reaction, whereas the high frequency intercept on the X‐ axis reveals the series resistance (R Ω ), which includes electrolyte resistance, the internal resistance of the active material, and the contact resistance at the solid‐liquid interface . The R ct and R Ω for the air‐annealed and H 2 ‐treated Ti−Mo−Ni−O nanotubes were found to be 1.34 and 0.83 Ω, respectively.…”

Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

2020

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The charge storage performance of metal oxides as electrochemical supercapacitor electrodes is limited by their poor conductivity and limited operating potential window. Herein, we report on the oxygen-vacancy engineering of TiÀ MoÀ NiÀ O nanotubes via hydrogen annealing to boost their capacitive performance. Hydrogen treatment of the nanotubes resulted in 110% increase in specific capacitance as compared to the air-annealed counterpart with excellent stability over 3700 cycles and an exceptional capacitance retention of 99%. The observed enhancement can be ascribed to the faradaic capacitance contribution from the several redox pairs of Nickel, Molybdenum, and Ti 3 +. This was further confirmed via the electrochemical impedance spectroscopy measurements, revealing a drastic decrease in the internal resistance upon hydrogen treatment. We hope our demonstrated two-step interfacial engineering opens a new strategy to design high performance electrode materials for advanced electrochemical supercapacitors.

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The Intrinsic Charge Carrier Behaviors and Applications of Polyoxometalate Clusters Based Materials

et al. 2021

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Polyoxometalates (POMs) are a series of molecular metal oxide clusters, which span the two domains of solutes and solid metal oxides. The unique characters of POMs in structure, geometry, and adjustable redox properties have attracted widespread attention in functional material synthesis, catalysis, electronic devices, and electrochemical energy storage and conversion. This review is focused on the links between the intrinsic charge carrier behaviors of POMs from a chemistry‐oriented view and their recent ground‐breaking developments in related areas. First, the advantageous charge transfer behaviors of POMs in molecular‐level electronic devices are summarized. Solar‐driven, thermal‐driven, and electrochemical‐driven charge carrier behaviors of POMs in energy generation, conversion and storage systems are also discussed. Finally, present challenges and fundamental insights are discussed as to the advanced design of functional systems based upon POM building blocks for their possible emerging application areas.

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Metal–Organic frameworks encapsulated with vanadium-substituted heteropoly acid for highly stable asymmetric supercapacitors

Cited by 51 publications

References 55 publications

Fullerene C₇₆: An Unexplored Superior Electrode Material with Wide Operating Potential Window for High‐Performance Supercapacitors

Fullerene C₇₆: An Unexplored Superior Electrode Material with Wide Operating Potential Window for High‐Performance Supercapacitors

Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

The Intrinsic Charge Carrier Behaviors and Applications of Polyoxometalate Clusters Based Materials

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Metal–Organic frameworks encapsulated with vanadium-substituted heteropoly acid for highly stable asymmetric supercapacitors

Cited by 51 publications

References 55 publications

Fullerene C76: An Unexplored Superior Electrode Material with Wide Operating Potential Window for High‐Performance Supercapacitors

Fullerene C76: An Unexplored Superior Electrode Material with Wide Operating Potential Window for High‐Performance Supercapacitors

Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

The Intrinsic Charge Carrier Behaviors and Applications of Polyoxometalate Clusters Based Materials

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Fullerene C₇₆: An Unexplored Superior Electrode Material with Wide Operating Potential Window for High‐Performance Supercapacitors

Fullerene C₇₆: An Unexplored Superior Electrode Material with Wide Operating Potential Window for High‐Performance Supercapacitors